Pyoderma gangrenosum is an uncommon ulcerative cutaneous dermatosis associated with a variety of systemic diseases including inflammatory bowel disease, arthritis, hematological malignancies, hepatitis and acquired immunodeficiency syndrome (AIDS). The pathogenesis of pyoderma gangrenosum remains unknown. Its diagnosis is usually based on clinical evidence and confirmed through a process of elimination of the other possible causes of cutaneous ulcers. This report describes a case of pyoderma gangrenosum with extensive ulceration that responded well to treatment. Keywords: Diagnosis; Primary Treatment; Pyoderma gangrenosum Resumo: Pioderma gangrenoso é uma dermatose cutânea ulcerativa incomum, associada a uma variedade de doenças sistêmicas, incluindo doença inflamatória intestinal, artrites, neoplasias hematológi-cas, hepatites e aids. A sua patogênese é desconhecida. O diagnóstico geralmente é baseado em evidên-cias clínicas e confirmado com a exclusão das outras etiologias de lesões ulceradas cutâneas. Relatamos um caso de PG com ulcerações extensas com boa resposta ao tratamento.

Generalized pustular psoriasis, or psoriasis of von Zumbusch, is an acute and severe clinical form of psoriasis, which usually occurs in patients with psoriasis undergoing aggravating factors. In this work, we report the case of a female patient, 70 years old, who developed generalized pustular psoriasis symptoms while reducing the dose of oral corticosteroids, improperly introduced for the treatment of alleged acute generalized exanthematous pustulosis. The differential diagnosis of generalized pustular psoriasis should be made with other pustular dermatoses, such as subcorneal pustulosis, IgA pemphigus and especially with acute generalized exanthematous pustulosis. Personal history of psoriasis and histopathological findings with psoriasiform changes and subcorneal pustule favored the diagnosis. She was treated with acitretin 30 mg / day, progressing to complete regression of the lesions.

Abstract:Amyloidosis results from deposition of fibrous and insoluble amyloid protein in extracellular spaces of organs and tissues. Amyloid deposition can be localized or systemic and either primary or secondary. We report a case of localized primary cutaneous nodular amyloidosis manifested by papular-nodular, reddish-brown lesions affecting the nasal area, without evidence of systemic involvement. Immunohistochemistry showed the presence of immunoglobulin kappa light chain. Keywords: Amyloidosis; Plasma cells; Skin Resumo: A amiloidose resulta da deposição de proteína amiloide fibrosa e insolúvel em espaços extracelulares de órgãos e tecidos. O depósito da substância amiloide pode ser localizado ou sistêmico e pode ser de natureza primária ou secundária. Relataremos um caso de amiloidose localizada cutânea primária nodular, manifesta por lesões pápulo-nodulares, eritêmato-acastanhadas, acometendo a região nasal, sem evidência de acometimento sistêmico. O estudo imunoistoquímico demonstrou presença de imunoglobulinas de cadeia leve kappa.

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Bednar tumor is a rare skin neoplasm, considered to be a pigmented variant of dermatofibrosarcoma protuberans. Diagnosis is confirmed through histopathologic examination and immunohistochemical evaluation. Bednar tumor is aggressive locally and recurrences are frequent, but metastases are rare. The most appropriate therapeutic procedure is Mohs' micrographic surgery. The case report presents a 35-year-old patient with this rare neoplasm in which the diagnosis was established through histopathologic examination and immunohistochemical study. The importance is emphasized for dermatologists to be attentive for diagnostic suspicion and have available the necessary means to confirm the diagnosis in order to adopt the best procedure.